"American logician" . . . "Post, Emil Leon"@en . "1954-04-21Z"^^ . "Emil Leon Post (February 11, 1897 \u2013 April 21, 1954) was a Polish-born American mathematician and logician. He is best known for his work in the field that eventually became known as computability theory."@en . . . "1897Z"^^ . "1954Z"^^ . . . . "Emil Leon Post"@en . . . . . . . . "1897-02-11Z"^^ . .